Manufacture of waterproof paint



D. B. MITCHELL ET AL MANUFACTURE OF WATERPROOF PAINT Filed May 28. 1923 Y 51 1/0241 1'61 MB Ma /371,6 a, @07 6 JMzLZcizeZQ Patented July 22, 1924.

UNITED STATES PATENT 1,502,514 OFFICE.

DAVID B. mrcnam, AND enonoa J. MITCHELL, or mm m, much manuracruan orwarnaraoor ram.

A ppllcationflled m 25, 1923. Serial no. 641,844.

To all whom it may concern:

Be it known that we, DAVID B. MITCHELL and GEORGE J. MITCHELL, citizens of the United States, and residents of Louisville in the county of Jefferson and" State of Kentucky, have invented certain new and useful Improvements in the Manufacture of Waterproof Paint, of which the following is a specification. d A

Our invention relates to the manufacture.

of waterproof paint.

In carrying our invention into practice, it has been our purpose to produce novel and efiicient bases and vehiclesfor waterproof paint of such nature that we are enabled to completely utilize, in the manufacture thereof, commercial tire rubber having fabric vulcanized therein, as exemplified by old discarded automobile tires. 20

It is also our purpose to provide a novel and advantageous process for rendering the rubber and fabric of discarded automobile tires into such form that their elements can be entirely utilized to great advantage in the production of our improved paint bases and which process will also provide other ingredients for use as a vehicle in our improved paint or independently thereof.

Furthermore, it is our purpose to pro vide a novel and eificient apparatus for carrying out the aforementioned process in an economical manner.

In describing our invention in detail we.

. the furnace 11 by a pipe 8 having a damper 8'. As a result of this construction it will be apparent that by closing the damper 7 and opening the damper 8', the heat generated in the furnace 2 may be transmitted to the furnace 11, inlieu of directly firing the latter. Access to the interior of the cookers A and B is had through manholes in the top thereof which are closed by detachable covers 4 and 12 respectively. The cooker A carries therein a horizontal perforated partition t, spaced from the bottom of th cooker. This partition is of a suitable folding type, whereby it may be applied and removed t rough the manhole closed by the cover 4. A corresponding partition 10 is provided in the cooker B. A valved pipe 5 connects the top of the interior of the cooker A with the B, the connection of said ipe with the cooker B being at a point be ween the bottom of the cooker and the partition 10. Our apparatus further embodies condensers C and D of well known construction, the upper end of the condenser C being connected with the top of the interior of the cooker B by a valved pipe 14, while the condenser C is connected adjacent its lower end with the condenser D by a valved pipe 22. The condensers C and D are further provided with condensate drain valves 21 and 28 respectively for a purpose that will gredients completely utilizing every por--.

tion of such fabric carrying commercial tire rubber. In car ing our process into effect through the me ium of said apparatus we remove the cover 4 of cooker A and in turn remove the partition 3. We then place a charge of rosin on the bottom of said cooker and replace the partition. On this partition we place a charge of fabric carrying commercial tire rubber, such as old discarded automobile tires, and restore the cover 4. The chargesv placed in the cooker are in the proportion of substantially 30% rosin and. 70% fabric carrying commercial tire rubber. We then remove the cover 12 of cooker B and place a suitable charge of said rubber on partition 10. The cover 12 is then replaced, the damper 7' closed and damper 8 opened. The furnace 2 is then fired to maintain the temperature of the cooker A at substantially 450 F. Under those conditions, the charge of rosin will be progressively vaporized and such vapor will pass through the perforations of partition 3 and contact with the rubber and interior of the cooker said material will progressively render the rubber fluent and so act on the fabric as to cause the latter to completely disintegrate when sub'ected to sli ht pressure or in other wor s, the fabric ecomes a mere rubber impfignated pulp with no appreciable body texture. As the rubber becomes fluent it flows through the perforations of the partition 3 into the rosin therebeneath and this mixture is drawn off through valve 6. The rubber impregnated fabric remainin on partition 3 is then removed, crushed an ground and the resulting product incorporated in the mixture of rosin and rubber previously withdrawn through valve 6 to produce our improved base for waterproof paint of a coarse grade. While the cooking operation in cooker A is proceeding, it will be apparent that the cooker B will be suitably heated by the products of combustion passing through pipe A from furnace 2. Likewise the rosin vapor which passes through the material on partition 3 in cooker A will in turn enter the cooker B below partition 10 by way of pipe 5 and act on the material carried by the partition 10 to render the rubber fluent and destroy the body texture of the rubber permeated fabric. The rubber rendered fluenton the partition 10 will flow into th lower portion of cooker by way B and is then drawn off through valve 15. The rubber permeated fabric remaining on partition 10 is then removed, ground and crushed, and mixed with the fluent rubber drawn off at valve 15 to provide a more refined base for waterproof paint. The refinement of this base. over the corresponding base obtained from cooker A is due to the fact that the rendered material is not directly mixed with the rosin and is further removed from the cooking charge of the latter, and therefore, such base does not contain the heavy, sticky, resinous substance present in the base obtained from cooker A.

Our process and apparatus further provides a suitable. and desirable vehicle for the paint bases previously described by converting the vapor of the rosin into an oil 'through the medium of condensation. We

accomplish this end by conveying the vapor from cooker B to condenser C by means of pipe 14. That portion of the vapor which is condensed by the condenser C is drawn off at valve 21, while that portion which is not so condensed is carried to condenserD of pipe 22 where it is in turn condensed and forms a lighter oil than that produced by condenser G. Our improved paint bases can be mixed with either of these oils to provide the finished paint or they can be associated with any other desirablepaint vehicle. Likewise the oils obtained at condensers C and D can be associated with any desired paint bases or used independently. For instance, we have disin such manufacture is now generally recognized as practically worthless. We also desire to call attention to the fact that the quality of finished paints having our improved bases are greatly enhanced by reason of the presence of ground and crushed fabric therein of the type heretofore described, which element we have found acts as a most efficient binder when the paint is ap lied.

e claim 1. The process of producing a base for waterproofpaint which consists inrendering commercial tire rubber fluent by contactin the vapor of heated rosin therewith and then mixing the fluent rubber with heated rosin.

2. The process of producing a base for waterproof paint which consists in rendering commercial tire rubber fluent by contacting the vapor of heated rosin therewith and allowing the fluent rubber as it forms to flow into the heated rosin from which said vapor emanated.

3. The process of producing a base for waterproof paint which consists in contacting the vapor of heated rosin with commercial tire rubber having fabric vulcanized therein to render the rubber fluent, mixing the fluent rubber with heated rosin, then crushing and grinding the remaining fabric and residue of rubber in association therewith and mixing the same with the previously obtained mixture of rubber and rosin.

4:. The rocess of producing a base for waterproo paint which consists in contacting the vapor of heated rosin with commercial tire rubber having fabric vulcanized therein to render the rubber fluent, draining off the resultant fluent rubber as it forms into the heated rosin from which said vapor emanated, then crushing and grinding the remaining fabric and the residue of rubber in association therewith and mixing the same with the previously obtained mixture of rubber and rosin.

5. The process of disintegrating commer- 6. Theprocess of producing a base for waterproof paint which consists in confining a charge of commercial tire rubber above a charge of rosin in an air tight cooker, heating the rosin to a temperature sufficiently elevated'to cause vapor to emanate therefrom, contacting this vapor with the rubber to render the latter fluent, draining the fluent rubber as it forms into the heated charge of rosin and then draining off the mixture of rubber and rosin.

7. The process of producing a base for Waterproof paint which consists in confining a charge of commercial tire rubber, having fabric vulcanized therein, above a charge of rosin in an air tight cooker, heat ing the rosin to a temperature sufiiciently elevated to cause vapor to emanate therefrom contacting this vapor with the rubber and fabric to render the rubber fluent, draining the fluent rubber as it forms intothe heated charge of rosin, drawing off the mix ture of rubber and rosin, removing and crushing and grinding the fabric, and then mixing the ground and crushed fabric with the mixture of rubber and rosin.

8. The process of producing a base for waterproof paint which consists in confining a charge of commercial tire rubber, having fabric vulcanized therein, above a charge of rosin in an air tight cooker, maintaining the temperature of the rosin at substantially 450 F. until the resulting vapor from the rosin contacting with the rubber and fabric renders the former fluent, draining the fluent rubber 'as it forms into the heated charge of rosin, drawing oif the mixture of rubber and rosin, removin and crushing and grinding the fabric, and then mixing the crushed and ground fabric with the mixture of rubber and rosin.

9. The rocess of producing a base for waterproof paint which consists in confining in an air tight cooker a charge of commercial tire rubber, having fabric vulcanized therein, above a charge of rosin, in the proportion of 70% rubber and fabric and 30% rosin, heating the rosin to a temperature sufliciently elevated to cause vapor to emanate therefrom, contacting this vapor with the rubber and fabric to render the former fluent, draining the fluent rubber'as it forms into the heated charge of rosin, drawing off the mixture of rubber and rosin, removing and crushing and grinding the fabric and then mixing the crushed and ground fabric with the mixture of rubber and rosin.

10. The process of producing a base and vehicle constituents of waterproof paint which consists in contacting the vapor of heated rosin with commercial tire rubber having fabric vulcanized therein to render said rubber fluent, condensing the vapor from the rosin which passes through the rubber to form the paint vehicle, draining the fluent rubber from the fabric, crushing and grinding the fabric, and then mixing the crushed and ground fabric with the previously drained fluent rubber to form the paint base.

11. The process of producing a base for waterproof paint which consists in contacting the vapor of heated rosin with commercial tire rubber, havin fabric vulcanized therein, to render the ru ber fluent, draining the fluent rubber from the fabric, crush ing and grinding the fabric and then mixing the crushed and ground fabric with the previously drained fluent rubber.

12. A waterproof paint formed of a base of rubber, fabric and rosin, and a vehicle constituted by the condensate of the vapor of heated rosin after the latter has passed through a massof rubber.

13. The process of producing abase for waterproof paint which consists in rendering rubber fluent by contact with the vapor of heated rosin therewith and then mixing the fluent rubber with heated rosin. 14. The process of producing a base for waterproof paint which consists in contacting the vapor of heated rosin with rubber havin fabric vulcanized therein to render the rubber fluent, draining the fluent rubber from the fabric, crushing and grinding the fabric, and then mixing the crushed and ground fabric with the previously drained fluent rubber.

In testimony whereof we hereunto afiix Y our signatures.

DAVID B. MITCHELL. GEORGE J. MITCHELL. 

